Connecting-rod for pistons.



H. J. KIMMAN.

CONNECTING ROD FOR PISTONS. APPLICATION FILED DEC-H. \91'4. RENEWED FEB. 25.

I9l6 Patented Apr. 11, 1916.

I "NEK fifivqspnp 7720/27 ED STA s HENRY J. KIMMAN, or CLEVELAND, OHIO, ASSIGNOR T cnrcaeezgrnniiuuarrc 'roor. COMPANY, or omoaco, rumors, A oonroaarion or JERSEY.

I CONNECTING-ROD roze Specification of Letters Patent.- i Pafgnted Apr. 11, 1916.

Application filed December 11, 1914, Serial No. 876,606. Renewed February 25, 1916. Serial No. 80,541.

To all whom it may concern:

Be it known that I, HENRY JEKIMMAN,

1 a citizen of the United States, residing at or pitmen for pistons, etc., and one of the objects thereof-is to form a simple and efiicient means for connecting the outer end of the rod with the piston so that in case of breakage of either part thesame may be de tached and a new part substituted- In the drawing, Figure 1 is a central 1011- I gitudinal section of a piston and connect- I ing rod including its crank bearing embodying my invention; Fig. 2 an elevation thereof; Fig. 3 a secti'onal'plan onthe line 3 3 of Fig. 1; Fig. 1 a sectional plan on the hue.

4 4 of Fig. 1; Fig. 5 a detail section of the locking device for locking the rod to its bearing; Fig. 6 a. section on the 'line 66 of Fig. 5; Fig. 7 a perspective ofthe tool or .wrench utilized in the operation of remov ing or detaching the rod from the plston;

and. Fig. 8 a detail view of the locking washer. 4 Referring to the particular embodiment of my invention as herein shown the piston 1 is provided with a connecting rod 'or pitman 2 connected at its outer end with the inner portion of the head ofthepiston and at its inner end with the bearing 3 which cooperates with the crank or wrist pin, not shown. j

Referring first to the means whereby-the rod is connected to the piston, the piston is formed with a tubular boss 1 which is located within the trunk of the piston and provided with a portion 1 of the socket to receive the ball end 2'? ofthe connecting rod. This boss is externally screw-threaded in order to receive the internally screw-threaded cap 4 having a central bore through which the rod ,2 passes and also with a socket 4 which forms a part of the socket for the ball end 2" of such rod, the two socket portions Hand 4" forming the socket bearing for this ball end 2. As shown in Figs. 1 and 3 this cap is provided with a series of radial projections or wings 4" which, before the cap is screwed upon the boss, occupy the angular position shown in dotted lines in Fig. 1. After the cap has been screwed into place these projections are utilized for the purpose of locking the cap against any possibility of unscrewing.

To this end these projections are forced downwardlyto or toward the'horizontal position as shown in dotted'lines in Fig. 1. When in this position these projections hold the cap with-considerable frictional resistance, so that in the operation of the piston it is impossible for these parts to loosen up. When it is desired to remove'the cap in case of breakage of the connecting rod, for instance, the piston is put into a suitable vise for holding it and a suitable tool such as the wrench 5-illustrated in Fig. "7* is employed for engagingthe cap and unscrewing the same from the boss. This wrench is pro.- vided at its outer end with a series of projections 5* which enter between the-projections 1 and permit said engagement; The frictional resistance caused by the projections 4 is not of course such as to prevent unscrewing of-thecap when positive force is applied by means. of this wrench. When the cap 4 is removed the old connectin rod can be removed and a new one inserte and the new cap ,4 or the old cap, after its projections 4 have been bent back to said angular position, is'then used for securing the new'connect'ing rod inplace.

'Referring to the locking means between the other end of the'connecting rod 2 and its bearing 3, this hearing is made in two parts which are pivoted at 3. Their inner ends when brought together form two members of a tubular sleeveB", which is provided externally with a straight thread. This sleeve is provided interna ly with a bore corresponding to the shape of the connecting rod 2 which is cylindrical and of uniform diameter except near its inner end where it has a reduced portion 2. The. securing and locking, device consists of a two-part, nut. Theouter part of thisnut is in the form of a sleeve '6 having an angular exterior to receive a wrench'or the like and a smooth bore to receive a second sleeve 7 which is split at 7 and also internally screw threaded, as seen in Fig. 5. 'At'its upper end this inner sleeve is formed with atransverse block 7 having a central bore through which the rod 2 passes and is received within a transverse slot in the outer end of the sleeve 6. The purpose of this latter arrangement is to pre Q a 1,17e,1 .o

, vent circumferential movement of the two sleeves 6 and 7 relative to each other but to permit longitudinal movement of the inner sleeve with respect to the outer. When the outer sleeve or nut is turned the inner sleeve is rotated therewith and at the sametime moves longitudinally thereof during which time such inner sleeve 7 is contracted by reason of the tapering inner walls of the outer sleeve with the result that it'becomes securely clamped upon the screw-threads of Y the sleeve 3 of the connecting rod bearing. In this manner the members of the bearing igare clamped and held tightly upon the connecting rod-and prevented from loosening. I -As a matter of precaution I also employ the locking washer shown in Fig. 8, the same boss and having means for engaging the inner walls of the piston, and a connecting rod having a ball end received by said socket.

2. The combination of a piston having on its inner side a screw-threaded boss provided with a socket, a cap screwing onto said boss and having a series of marginal projections adapted to be forced against the inner walls of the piston to hold the cap from unscrewing, and a connecting rod having a ball end received by said socket.

3. The combination of a piston having on its inner side a screw-threaded boss provided with a socket, a cap screwing onto said boss and having an internal socket, said cap being provided with a series of radial projections 4 originally at an oblique angle to the cap but adapted to be forced toward right angles thereto and against the inner walls of the piston to hold the cap from unscrewing, and a connecting rod having a ball end received by said socket.

, HENRY J. KlMltlA'fi. Witnesses:

JENNIE W. LALIME, A. HAFFNER. 

